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<meta property="og:description" content="写在前面：内容包括demo代码，应用和定义，以及参考文献，本文主要内容是学习js期间学到的一些实用的零碎的js1知识，我都记下来了，需要的朋友可以过来参考下，前后可能没有太大的相关性。喜欢的可以点个赞，希望对大家有所帮助。Python shuffle()方法语法1shuffle (lst ) 参数lst – 这可能是一个列表或元组。作用：打乱一个有序数组，最高效的数组乱序方法应用：打乱输出后，从头">
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<meta name="twitter:description" content="写在前面：内容包括demo代码，应用和定义，以及参考文献，本文主要内容是学习js期间学到的一些实用的零碎的js1知识，我都记下来了，需要的朋友可以过来参考下，前后可能没有太大的相关性。喜欢的可以点个赞，希望对大家有所帮助。Python shuffle()方法语法1shuffle (lst ) 参数lst – 这可能是一个列表或元组。作用：打乱一个有序数组，最高效的数组乱序方法应用：打乱输出后，从头">
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        <p><strong>写在前面：</strong>内容包括demo代码，应用和定义，以及参考文献，本文主要内容是学习js期间学到的一些实用的零碎的js1知识，我都记下来了，需要的朋友可以过来参考下，前后可能没有太大的相关性。喜欢的可以点个赞，希望对大家有所帮助。<br><strong>Python shuffle()方法</strong><br><strong>语法</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">shuffle (lst )</span><br></pre></td></tr></table></figure></p>
<p><strong>参数</strong><br>lst – 这可能是一个列表或元组。<br><strong>作用：</strong><br>打乱一个有序数组，最高效的数组乱序方法<br><strong>应用：</strong><br>打乱输出后，从头输出可用来输出随机数字。</p>
<p>这里有篇文章介绍数组乱序效率<a href="http://www.jb51.net/article/56099.htm" target="_blank" rel="noopener">http://www.jb51.net/article/56099.htm</a></p>
<p><strong>HTML DOM removeAttribute() 方法</strong><br><strong>定义和用法</strong><br> removeAttribute() 方法删除指定的属性（可用来清空设置的style属性）</p>
<p>语法<br>element.removeAttribute(attributename)<br><strong>效果</strong></p>
<p><img src="http://upload-images.jianshu.io/upload_images/5245297-25750b2c9fd07c2d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="代码和效果"></p>
<p><img src="http://upload-images.jianshu.io/upload_images/5245297-a6748685a3b14789.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="Paste_Image.png"></p>
<p><strong>demo(demo比较长，放在文末)</strong></p>
<p><strong>audio.pause引用JQury导致不能正常播放</strong>(引用音频，不能调用JQ的函数，否则会导致音频无法播放。)<br><strong>问题描述：</strong>之前调用JQ的$，来获取dom，然后下面的pause就显示没有定义，因为这里调用了JQ，JQ里面没有封装pause，导致pause没有定义。<br><strong>正确的代码</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">//之前引入JQ，然后用$(&quot;music&quot;),会报错。因为pause没在JQ里面封装函数，不能调用JQ，所以要用getElementById(&quot;music&quot;);获取dom。</span><br><span class="line">var audio=document.getElementById(&quot;music&quot;);</span><br><span class="line">function runMusic() &#123;//这是一个点击事件</span><br><span class="line">    if (audio.paused)&#123;</span><br><span class="line">        audio.play();</span><br><span class="line">    &#125;else &#123;</span><br><span class="line">        audio.pause();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p><strong>split()方法</strong><br><strong>语法</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">string.split(separator,limit)</span><br></pre></td></tr></table></figure></p>
<p><strong>参数</strong><br><strong>separator:</strong>可选。字符串或正则表达式，从该参数指定的地方分割 string Object。</p>
<p><strong>limit:</strong>可选。该参数可指定返回的数组的最大长度。如果设置了该参数，返回的子串不会多于这个参数指定的数组。如果没有设置该参数，整个字符串都会被分割，不考虑它的长度。</p>
<p><strong>用法：</strong>split() 方法用于把一个字符串分割成字符串数组。<br><strong>提示：</strong> 如果把空字符串 (“”) 用作 separator，那么 stringObject 中的每个字符之间都会被分割。<br><strong>注意：</strong> split() 方法不改变原始字符串。<br><strong>demo</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">var a =&quot;1,2,3,4,5,6&quot;//这是一个字符串变量，里面包含&quot;1,2,3,4,5,6&quot;这个字符串。</span><br><span class="line">var B = a.split(&quot;,&quot;)//从逗号处分割成一个字符串，返回值是数组B=[1,2,3,4,5,6];</span><br></pre></td></tr></table></figure></p>
<p><strong>后话：</strong>这次就先记这三个，还有一些没记，以后再记。（下面有removeAttribute() 方法的demo*）</p>
<p><strong>最后又到了观众朋友们最喜欢的求赞求关注环节：</strong>希望看完的朋友点个喜欢，想关注我这个菜鸡是如何成长的也可以关注一下我，基本上每个月都不会少于十五篇文章（看到干货我也会进行分享）。码字不易，感谢支持，感激不尽！<br><strong>ps</strong>：如果希望我写哪方面的文章可以在底下评论，或者是私信我，虽然写的不好，但我就当这是记录自己成长的一种方式咯。（前提是我会了，如果不会我也会记下来，等会了的时候再更出来。）<br><a href="http://www.jianshu.com/u/8d1dd8c80f06" target="_blank" rel="noopener">简书主页链接</a>，<strong><a href="http://blog.csdn.net/OBKoro1?skin=dark1" target="_blank" rel="noopener">csdn博客主页链接</a></strong></p>
<p><strong>removeAttribute() 方法,demo</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br></pre></td><td class="code"><pre><span class="line">&lt;!DOCTYPE HTML&gt;</span><br><span class="line">&lt;html&gt;</span><br><span class="line">&lt;head&gt;</span><br><span class="line">&lt;meta http-equiv=&quot;Content-Type&quot; Content=&quot;text/html; charset=utf-8&quot; /&gt;</span><br><span class="line">&lt;title&gt;javascript&lt;/title&gt;</span><br><span class="line">&lt;style type=&quot;text/css&quot;&gt;</span><br><span class="line">body&#123;font-size:12px;&#125;</span><br><span class="line">#txt&#123;</span><br><span class="line">    height:400px;</span><br><span class="line">    width:600px;</span><br><span class="line">	border:#333 solid 1px;</span><br><span class="line">	padding:5px;&#125;</span><br><span class="line">p&#123;</span><br><span class="line">	line-height:18px;</span><br><span class="line">	text-indent:2em;&#125;</span><br><span class="line">&lt;/style&gt;</span><br><span class="line">&lt;/head&gt;</span><br><span class="line">&lt;body&gt;</span><br><span class="line">  &lt;h2 id=&quot;con&quot;&gt;JavaScript课程&lt;/H2&gt;</span><br><span class="line">  &lt;div id=&quot;txt&quot;&gt;</span><br><span class="line">     &lt;h5&gt;JavaScript为网页添加动态效果并实现与用户交互的功能。&lt;/h5&gt;</span><br><span class="line">        &lt;p&gt;1. JavaScript入门篇，让不懂JS的你，快速了解JS。&lt;/p&gt;</span><br><span class="line">        &lt;p&gt;2. JavaScript进阶篇，让你掌握JS的基础语法、函数、数组、事件、内置对象、BOM浏览器、DOM操作。&lt;/p&gt;</span><br><span class="line">        &lt;p&gt;3. 学完以上两门基础课后，在深入学习JavaScript的变量作用域、事件、对象、运动、cookie、正则表达式、ajax等课程。&lt;/p&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line">  &lt;form&gt;</span><br><span class="line">  &lt;!--当点击相应按钮，执行相应操作，为按钮添加相应事件--&gt;</span><br><span class="line">    &lt;input type=&quot;button&quot; value=&quot;改变颜色&quot; onclick=&quot;color()&quot; /&gt;</span><br><span class="line">    &lt;input type=&quot;button&quot; value=&quot;改变宽高&quot;  onclick=&quot;widthHeight()&quot;/&gt;</span><br><span class="line">    &lt;input type=&quot;button&quot; value=&quot;隐藏内容&quot;  onclick=&quot;cantent()&quot;/&gt;</span><br><span class="line">    &lt;input type=&quot;button&quot; value=&quot;显示内容&quot;  onclick =&quot;block()&quot;/&gt;</span><br><span class="line">    &lt;input type=&quot;button&quot; value=&quot;取消设置&quot; onclick=&quot;recover()&quot; &gt;</span><br><span class="line">  &lt;/form&gt;</span><br><span class="line">  &lt;script type=&quot;text/javascript&quot;&gt;</span><br><span class="line">//定义&quot;改变颜色&quot;的函数</span><br><span class="line">var cantent_box = document.getElementById(&quot;txt&quot;);</span><br><span class="line">function color()&#123;</span><br><span class="line">    cantent_box.style.color = &quot;red&quot;;</span><br><span class="line">    cantent_box.style.backgroundColor = &quot;blue&quot;;</span><br><span class="line">&#125;</span><br><span class="line">function widthHeight()&#123;</span><br><span class="line">    cantent_box.style.width =&quot;100px&quot;;</span><br><span class="line">    cantent_box.style.height =&quot;600px&quot;;</span><br><span class="line">&#125;</span><br><span class="line">function cantent()&#123;</span><br><span class="line">    cantent_box.style.display =&quot;none&quot;;</span><br><span class="line">&#125;</span><br><span class="line">//定义&quot;改变宽高&quot;的函数</span><br><span class="line">//定义&quot;隐藏内容&quot;的函数</span><br><span class="line">function block()&#123;</span><br><span class="line">    cantent_box.style.display = &quot;block&quot;;</span><br><span class="line">&#125;</span><br><span class="line">//定义&quot;显示内容&quot;的函数</span><br><span class="line">function recover()</span><br><span class="line">    &#123;var open=confirm(&quot;是否取消设置&quot;);</span><br><span class="line">    if(open==true)</span><br><span class="line">    &#123;</span><br><span class="line">       txt.removeAttribute(&quot;style&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//定义&quot;取消设置&quot;的函数</span><br><span class="line"></span><br><span class="line">  &lt;/script&gt;</span><br><span class="line">&lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure></p>

      
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